I use the CRK flourinated grease on anything with washers. Two small dabs on the blade side of the washers. On washerless knives, some side opening autos, and all my OTF autos I use slide oil. It's used on the slides of brass instruments like the trombone. It's odorless, tasteless, foodsafe, and weatherproof. It makes for a pretty great lube for knives.